treenodecollectioneditor.cs

浏览器端看到树型目录结构,用户可以完整地看到像windows资源管理器一样的效果

//------------------------------------------------------------------------------
// Copyright (c) 2000-2003 Microsoft Corporation. All Rights Reserved.
//------------------------------------------------------------------------------

namespace Microsoft.Web.UI.WebControls.Design
{

    using System.Runtime.InteropServices;
    using System.ComponentModel;
    using System;
    using System.Design;
    using System.Collections;
    using Microsoft.Win32;    
    using System.ComponentModel.Design;
    using System.Diagnostics;
    using System.Drawing;
    using System.Windows.Forms;
    using Microsoft.Web.UI.WebControls;

    /// <summary>
    /// The TreeNodeCollectionEditor is a collection editor that is 
    /// specifically designed to edit a TreeNodeCollection.
    /// </summary>
    internal class TreeNodeCollectionEditor : CollectionEditor
    {
        /// <summary>
        /// Constructs a new instance of a TreeNodeCollectionEditor.
        /// </summary>
        public TreeNodeCollectionEditor() : base(typeof(Microsoft.Web.UI.WebControls.TreeNodeCollection))
        {
        }

        /// <summary>
        /// Creates a new form to show the current collection.
        /// You may inherit from CollectionForm to provide your own form.
        /// </summary>
        /// <returns>The form to show the currect collection.</returns>
        protected override CollectionForm CreateCollectionForm()
        {
            return new TreeNodeCollectionForm(this);
        }

        private class TreeNodeCollectionForm : CollectionForm
        {
            private int nextNode = 0;
            private Container components = new Container();
            private System.Windows.Forms.TreeView tvNodes = new System.Windows.Forms.TreeView();
            private Microsoft.Web.UI.WebControls.TreeView tvWebNodes = new Microsoft.Web.UI.WebControls.TreeView();
            private Button btnAddChild = new Button();
            private Button btnOK = new Button();
            private Button btnApply = new Button();
            private Button btnCancel = new Button();
            private Button btnDelete = new Button();
            private Button btnAddRoot = new Button();
            private Button upButton = new Button();
            private Button downButton = new Button();
            private Button leftButton = new Button();
            private Button rightButton = new Button();
            private Label lblNodes = new Label();
            private Label lblProp = new Label();
            private GroupBox groupBox1 = new GroupBox();
            private PropertyGrid propGrid = new PropertyGrid();            
            private object NextNodeKey = new object();

            public TreeNodeCollectionForm(CollectionEditor editor) : base(editor)
            {
                InitializeComponent();
            }
            
            private Microsoft.Web.UI.WebControls.TreeView TreeView
            {
                get
                {
                    if (Context != null && Context.Instance is Microsoft.Web.UI.WebControls.TreeView)
                    {
                        return (Microsoft.Web.UI.WebControls.TreeView)Context.Instance;
                    }
                    else
                    {
                        Debug.Assert(false, "TreeNodeCollectionEditor couldn't find the TreeView being designed");
                        return null;
                    }
                }
            }
            
            private System.Windows.Forms.TreeNode SelectedNode
            {
                get
                {
                    return tvNodes.SelectedNode;
                }

                set
                {
                    tvNodes.SelectedNode = value;

                    if (value == null)
                    {
                        propGrid.SelectedObject = null;
                        lblProp.Text = "Properties:";
                        btnAddChild.Enabled = false;
                        btnDelete.Enabled = false;
                        upButton.Enabled = false;
                        downButton.Enabled = false;
                        leftButton.Enabled = false;
                        rightButton.Enabled = false;
                    }
                    else
                    {
                        propGrid.SelectedObject = value.Tag;
                        lblProp.Text = value.Text + "'s Properties:";
                        btnAddChild.Enabled = true;
                        btnDelete.Enabled = true;
                        upButton.Enabled = (value.PrevNode != null);
                        downButton.Enabled = (value.NextNode != null);
                        leftButton.Enabled = (value.Parent != null);
                        rightButton.Enabled = (value.PrevNode != null);
                    }
                }
            }

            private int NextNode
            {
                get
                {
                    if (TreeView != null && TreeView.Site != null)
                    {
                        IDictionaryService ds = (IDictionaryService)TreeView.Site.GetService(typeof(IDictionaryService));
                        Debug.Assert(ds != null, "TreeNodeCollectionEditor relies on IDictionaryService, which is not available.");
                        if (ds != null)
                        {
                            object dictionaryValue = ds.GetValue(NextNodeKey);
                            if (dictionaryValue != null)
                            {
                                nextNode = (int)dictionaryValue;
                            }
                            else
                            {
                                nextNode = 0;
                                ds.SetValue(NextNodeKey, 0);
                            }
                        }    
                    }

                    return nextNode;
                }

                set 
                {
                    nextNode = value;
                    if (TreeView != null && TreeView.Site != null) 
                    {
                        IDictionaryService ds = (IDictionaryService)TreeView.Site.GetService(typeof(IDictionaryService));
                        Debug.Assert(ds != null, "TreeNodeCollectionEditor relies on IDictionaryService, which is not available.");
                        if (ds != null) 
                        {
                            ds.SetValue(NextNodeKey, nextNode);
                        }    
                    }
                }
            }

            private System.Windows.Forms.TreeNode Add(System.Windows.Forms.TreeNode parent) 
            {
                string strText = "Node" + NextNode++.ToString();
                System.Windows.Forms.TreeNode newnode;
                Microsoft.Web.UI.WebControls.TreeNodeCollection col;
                Microsoft.Web.UI.WebControls.TreeNode webNode;

                if (parent == null)
                {
                    newnode = tvNodes.Nodes.Add(strText);
                    col = tvWebNodes.Nodes;
                }
                else 
                {
                    newnode = parent.Nodes.Add(strText);
                    parent.Expand();
                    col = ((Microsoft.Web.UI.WebControls.TreeNode)parent.Tag).Nodes;
                }

                webNode = new Microsoft.Web.UI.WebControls.TreeNode();
                webNode.Text = strText;
                col.Add(webNode);
                newnode.Tag = webNode;

                btnApply.Enabled = true;

                return newnode;
            }

            private void BtnAddChild_click(object sender, EventArgs e) 
            {
                Add(SelectedNode);

                // Refresh arrow states
                SelectedNode = SelectedNode;
            }

            private void BtnAddRoot_click(object sender, EventArgs e) 
            {
                System.Windows.Forms.TreeNode rootNode = Add(null);
                if (SelectedNode == null)
                {
                    SelectedNode = rootNode;
                }
                else
                {
                    // Refresh arrow states
                    SelectedNode = SelectedNode;
                }
            }

            private void BtnDelete_click(object sender, EventArgs e) 
            {
                if (SelectedNode == null)
                {
                    return;
                }

                // Determine the new node to select
                System.Windows.Forms.TreeNode selNode = null;
                if (SelectedNode.NextNode != null)
                {
                    selNode = SelectedNode.NextNode;
                }
                else if (SelectedNode.PrevNode != null)
                {
                    selNode = SelectedNode.PrevNode;
                }
                else if (SelectedNode.Parent != null)
                {
                    selNode = SelectedNode.Parent;
                }

                ((Microsoft.Web.UI.WebControls.TreeNode)(SelectedNode.Tag)).Remove();
                SelectedNode.Remove();

                btnApply.Enabled = true;

                SelectedNode = selNode;
            }

            private void BtnOK_click(object sender, EventArgs e) 
            {
                object[] values = new object[tvWebNodes.Nodes.Count];
                for (int i = 0; i < values.Length; i++) 
                {
                    values[i] = ((ICloneable)tvWebNodes.Nodes[i]).Clone();
                }
                Items = values;
       
                btnApply.Enabled = false;
            }

            /// <summary>
            /// NOTE: The following code is required by the form
            /// designer.  It can be modified using the form editor.  Do not
            /// modify it using the code editor.
            /// </summary>
            private void InitializeComponent() 
            {
                tvNodes.Location = new Point(10, 30);
                tvNodes.Anchor = AnchorStyles.Top | AnchorStyles.Left | AnchorStyles.Bottom | AnchorStyles.Right;
                tvNodes.Size = new Size(271, 260);
                tvNodes.TabIndex = 1;
                tvNodes.Text = "tvNodes";
                tvNodes.HideSelection = false;
                tvNodes.ImageIndex = 0;
                tvNodes.Indent = 19;
                tvNodes.LabelEdit = true;
                tvNodes.AfterLabelEdit += new NodeLabelEditEventHandler(this.TvNodes_afterLabelEdit);
                tvNodes.AfterSelect += new TreeViewEventHandler(this.TvNodes_afterSelect);

                propGrid.CommandsVisibleIfAvailable = true;
                propGrid.Location = new Point(316, 30);
                propGrid.Size = new System.Drawing.Size(215, 260);
                propGrid.TabIndex = 10;
                propGrid.Anchor = AnchorStyles.Bottom | AnchorStyles.Top | AnchorStyles.Right;
                propGrid.PropertyValueChanged += new PropertyValueChangedEventHandler(this.PropertyChanged);

                btnOK.Location = new Point(256, 352);
                btnOK.Anchor = AnchorStyles.Bottom | AnchorStyles.Right;
                btnOK.Size = new Size(75, 23);
                btnOK.TabIndex = 11;
                btnOK.Text = "OK";
                btnOK.DialogResult = DialogResult.OK;
                btnOK.Click += new EventHandler(this.BtnOK_click);

                btnCancel.Location = new Point(350, 352);
                btnCancel.Anchor = AnchorStyles.Bottom | AnchorStyles.Right;
                btnCancel.Size = new Size(75, 23);
                btnCancel.TabIndex = 12;
                btnCancel.Text = "Cancel";
                btnCancel.DialogResult = DialogResult.Cancel;

                btnApply.Enabled = false;
                btnApply.Anchor = AnchorStyles.Bottom | AnchorStyles.Left;
                btnApply.Location = new Point(444, 352);
                btnApply.Size = new Size(80, 23);
                btnApply.TabIndex = 13;
                btnApply.Text = "Apply";
                btnApply.Click += new EventHandler(this.BtnOK_click);

                upButton.Anchor = AnchorStyles.Top | AnchorStyles.Right;
                upButton.Location = new Point(286, 30);
                upButton.Size = new Size(23, 23);
                upButton.TabIndex = 2;